A simple model for the estimation of the maximum percentage of deaths due to COVID-19 in sevarl US Locations with more than 250 total deaths
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NOTE:
“Disclaimer: Content from this website is STRICTLY ONLY for educational and research purposes and may contain errors. The model and data are inaccurate to the complex, evolving, and heterogeneous realities of different countries. Predictions are uncertain by nature. Readers must take any predictions with caution. Over-optimism based on some predicted end dates is dangerous because it may loosen our disciplines and controls and cause the turnaround of the virus and infection, and must be avoided.”
Statement copied from: https://ddi.sutd.edu.sg/
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The prediction based on a simple logistic model and:
For US locations here is the basic assumption: 70% of SARS-CoV-2 exposure
10% Infection efficacy i.e. 10% of the exposure subjects turns into a Covid-19 case
4.0% of Mortality
I will estimate the death rates based on current trends fitted to the logistic function.
The last 17 days will be used for the peak estimations. Peak estimations will be done using:
If the data has not reached the peak the plots will show estimations based on:
If the data reached the peak the plots will show:
The flattening of the curve will be plotted as a grey line. It represents the maximum expected number of deaths at that specified date. If the maximum number of deaths is going down future looks good!
The peaks locations as red diamonds. The estimated peaks are based on information from dates before the actual peak. You can use them to get an idea of how reliable the estimations were.
I am also providing optimistic models. I´m assuming that the # of fatalities are 1/3 of the total expected.
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Notes:
6/17/2020 Update:
Changed intial fit conditions and fit stop criteria.
https://github.com/joseTamezPena/COVID_Forecasting
# The expetec % of deaths in each City
expectedtotalFatalities = 0.70*0.10*0.04
optGain <- 3
# The number of observations used for the trends
daysWindow <- 17
today <- Sys.Date()
currentdate <- paste(as.character(today),":")
The data is the time_covid19ing set from CSSE at Johns Hopkins University:
Ploting some trends
Country.Region <- rownames(time_covid19US)
totaldeaths <- as.numeric(time_covid19US[,ncol(time_covid19US)])
names(totaldeaths) <- Country.Region
totaldeaths <- totaldeaths[order(-totaldeaths)]
ydata <- as.numeric(time_covid19US[names(totaldeaths[1]),])
ydata <- ydata[ydata > 1e-6]
plot(ydata,main="# Fatalities",xlab="Days",ylab="Fatalities",xlim=c(1,ncol(time_covid19US)))
text(length(ydata)-1,ydata[length(ydata)],names(totaldeaths[1]))
for (ctr in names(totaldeaths[1:30]))
{
ydata <- as.numeric(time_covid19US[ctr,])
ydata <- ydata[ydata > 1e-6]
lines(ydata)
text(length(ydata)-1,ydata[length(ydata)],ctr)
}
totaldeaths <- totaldeaths[!is.na(totaldeaths)]
totaldeaths <- totaldeaths[totaldeaths > 250]